Bart gets threats in the mail, and he soon learns it is from Bob. So the Simpsons relocate themselves. But little do they realize that Bob is following them. In the end, Bob is about to finally get Bart, but Bart tricks him by singing the entire score from the HMS Pinafore. And he is again arrested. Everything returns to normal, except for... Grandma?! Nah, it's Grampa looking like a woman because he did not have his pills.
This is one of the funniest episodes of the whole series. It's wacky too but almost every single jokes in it works.